Can't be answered without knowing who made it.
1 in 16" From the Speer #11 Reloading Manual.
The Savage 340 E in .222 Remington typically has a twist rate of 1:14 inches. This twist rate is designed to stabilize lighter bullets, usually in the range of 40 to 50 grains, which are commonly used with this caliber for varmint and target shooting. Always verify specific details with the manufacturer's specifications or a reliable source, as variations may exist.
four
http://www.gunpartscorp.com/Products/198420D.htm
%rate= (425/340) x100% = 125%
$250 - $300
% rate= (119/340) x 100% = 35%
Depends on which model. We carry magazines for the 340 series in .22 Hornet, and can get magazines for the older models. www.countrygunsmith.net Try Numrich gun parts http://www.egunparts.com
Without a serial number,I can only say that the savage model 340 was made from 1950-1985.If you would include the type of sights,barrel,barrel length,and stock design It would better help me in deciding with in which years your savage model 340 was produced.
% rate = 340%= 34/10 * 100%= 34 * 10%= 340%
% rate:= 3.40 * 100%= 340%
Model 340 bolt action: open sights, 22 and 24 inch barrel, 4 or 5 shot mag, 7 1/2 lbs, plain pistol grip stock manufactured 1950-1985 EL 340C, similar to Model 340, with aperture sight, checkered stock, and swing swivels manufactured 1952-60